Intoeing Gait in Children

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Intoeing Gait in Children Li et al REVIEW ARTICLES Intoeinggaitinchildren YHLi,JCYLeong Objective. To review the aetiology and management of intoeing. Data sources. Medline and non-Medline literature search, and personal experience. Study selection. Studies that provided evidence-based information about the aetiology and management of paediatric intoeing gait were selected. Data extraction. Data were extracted and reviewed independently by both authors. Data synthesis. An intoeing gait affects many children and, as with flexible flatfoot, bowleg, and knock-knee, it falls into the category of physiological problems that occur in normal children. The usual causes are excessive femoral anteversion, internal tibial torsion, and metatarsus adductus. Management is based on understanding the causes and the natural course of the condition and the effectiveness of various treatment modalities. Unfortunately, due to a poor understanding of the condition, intoeing is commonly overtreated with braces or special footwear. Conclusions. Intoeing is one of the most common conditions encountered in paediatric orthopaedic practice. It is important to make an early diagnosis of pathological causes of intoeing such as cerebral palsy and develop- mental dysplasia of the hips so that treatment can be commenced as soon as possible. HKMJ 1999;5:360-6 Key words: Child; Foot deformities, congenital; Gait; Hip joint/physiology; Movement Terminology demonstrate torsion. Tibial version or torsion is the angle measured between the transmalleolar axis and Rotation refers to the twist of the femur or the tibia the bicondylar axis of the proximal tibia at the knee. about the long axis of each bone. Rotation that is nor- mal in direction and magnitude is defined as ‘version’ The embryology of lower-extremity version and that which is abnormal is termed ‘torsion’. Further- more, ‘normal’ is defined as plus or minus two standard A basic knowledge of the embryological and foetal deviations from the mean.1 development of the musculoskeletal system is import- ant in the understanding of lower-extremity version. Rotation of a bone is determined by the angle The lower-extremity limb buds first appear as paddle- between reference axes at the proximal and distal ends shaped buds during the fifth to sixth weeks of gesta- of each bone. Rotation of the femur, for instance, is tion. The early limb bud continues its formation by the angle between the axis of the head/neck and the the migration and proliferation of the differentiating axis of the distal condyles at the most posterior points. mesenchymal tissues. By the end of the sixth week, If the angle between the proximal and distal axes is the limb buds have flattened and formed terminal hand positive, the femur is ‘anteverted’. If the angle between and foot plates and the early external form of the the proximal and the distal axes is negative, the femur limb. At approximately 7 weeks, the longitudinal axes is ‘retroverted’. If the angle is greater than two stand- of the upper and lower limb buds are parallel. The ard deviations from the mean, then the femur will pre-axial components face dorsally and the post-axial borders face ventrally. In this period, the position of Duchess of Kent Children’s Hospital, 12 Sandy Bay Road, Sandy the limb buds relative to the trunk change in a pre- Bay, Hong Kong YH Li, FRCS (Edin), FHKAM (Orthopaedic Surgery) determined manner not related to muscle activity or Department of Orthopaedic Surgery, The University of Hong Kong, inherent osseous torsion. The upper limb buds rotate Queen Mary Hospital, Pokfulam, Hong Kong externally and the lower buds internally, bringing JCY Leong, FRCS (Edin), FHKAM (Orthopaedic Surgery) the great toe to the midline from its initial post- Correspondence to: Dr YH Li axial position. Afterwards, mechanical intrauterine 360 HKMJ Vol 5 No 4 December 1999 Intoeing gait in children moulding of the lower limbs of the foetus takes the child’s present problem or fear that the current place, causing the femurs to rotate externally and the problem will persist and cause some long-term tibiae to do so internally.2-4 disability such as arthritis7,8 or make it difficult for the child to participate in sports or function normally? Femoral anteversion at birth is about 30 to 40°. Enquire about any family history of rotational prob- Because of the common intrauterine position of hip lems. Take a developmental history and ask about external rotation, the infant appears on examination to the nature of the disability such as tripping or falling. have more hip external rotation than internal rotation. Find out if the child prefers to sit on the floor in the This soft tissue external hip rotation contracture ‘W’ or reversed tailor position. decreases over the first year of life and the increased hip internal rotation expected from the femoral The physical examination anteversion starts to become apparent. There is a When evaluating a patient with a rotational abnormal- gradual decrease in femoral anteversion from 30 to 40° ity, begin by assessing the rotational profile. This at birth to the value of 10 to 15° by early adolescence, allows one to measure the severity of the rotational with most of this improvement occurring before 8 years problem. The rotational profile provides the informa- of age.5 tion needed to establish a diagnosis and to quantify the severity of the rotational problem present. In a computed tomography (CT) study of tibial torsion in the growing fetus, it was found that there Firstly, inspect the patient standing from the front. was an increase in external tibial torsion in the early When excessive femoral anteversion exists, the patel- stages of foetal life but that this gradually decreased lae face each other medially. Secondly, ask the child so that in the newborn, the tibial torsion was internal. to walk towards you and estimate the foot-progression After birth, the tibia rotates externally and the average angle (FPA)—the angular difference between the long version of the tibia at skeletal maturity is 15°.6 axis of the foot and the line of progression. Intoeing is denoted by a minus sign and out-toeing by a plus Causes of an intoeing gait sign. In a normal child, the FPA is +10° with a range from -3 to +20°. Thirdly, examine the child prone with In the infant, the most common cause is metatarsus the knees flexed 90°. To determine the amount of hip adductus. With this condition, the entire forefoot is rotation, allow both hips to fall into maximum inter- adducted at the tarsometatarsal level but the hindfoot nal and external rotation. The legs should be allowed is in its normal position. When present in the second to fall by gravity alone—do not use force. The amount year of life, intoeing is commonly due to internal of internal and external rotation of the hip should tibial torsion. After 3 years of age, this problem is normally be similar and the total arc should be about usually due to excessive femoral anteversion. When a 90°. Medial rotation more than 70° suggests a diagno- child toes-in severely, a combination of causes should sis of excessive femoral anteversion. It is considered be suspected. mild if the degree of internal rotation is 70 to 80° and the external rotation is 10 to 20°; moderate if internal Sometimes a rotational problem is a manifestation rotation is 80 to 90° and lateral rotation is 0 to 10°; of an underlying disorder such as cerebral palsy and and severe if the internal rotation of the hip is greater hip dysplasia. Before focusing on the rotational than 90° with no external rotation (Fig 1). problem, a physician must check that the rest of the musculoskeletal system is normal. Any clinical find- To determine the degree of tibial rotation, the thigh- ings such as abnormal muscle tone, gait abnormality, foot angle or the transmalleolar angle needs to be limitation of hip abduction, and leg length discrepancy estimated. The thigh-foot angle is the angular differ- should prompt a more intensive evaluation. ence between the axis of the foot and the axis of the thigh when the patient is in the prone position with Performing an evaluation the knees flexed 90° and the foot and ankle in neutral position. A negative value is given when the tibia is Taking a history rotated internally (internal tibial torsion) and a posi- Intoeing is extremely common in infants and children tive value given when the tibia is rotated externally and is a frequent cause of anxiety in parents. It is (external tibial torsion). In the infant, the thigh-foot important to identify the reason for the consultation angle is internal (negative) but it becomes progressively and what the parents’ concerns are; the parents’ external (positive) with increasing age. During child- concerns must be taken seriously. In addition, is it hood, the mean thigh-foot angle is +10° with a range HKMJ Vol 5 No 4 December 1999 361 Li et al 1a. 1b. Fig 2. A negative thigh-foot angle in a patient with internal tibial torsion The normal angle is about +10 to +15°. In this patient, the angle is -20° Imaging techniques used A physical examination usually provides sufficient information to formulate a treatment plan and further imaging is usually not required. There are, however, a number of imaging methods that can assess the amount of torsional deformity present in the bone. Imaging may need to be used in patients with hip dysplasia or cerebral palsy, or when significant Fig 1. Hip rotation in the prone position in a patient with excessive femoral anteversion rotational deformity does not resolve and corrective Normally, the internal and external rotation angles are more or surgery is needed.
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